lol, hell yah, that's just the window info, but a good porter will shape the rest of the flow appropriately, unless it's just another 4stroke porter following a templet...........and, how did i miss that guys' post? yah, "extrudehoned" or simply "pollished" on anything but the exhaust will alow the atomized fuel to find the "calm" area aginst the smooth surface and fall from the air......texture provides turbulance, like you find on a golf ball, and creates a coushin of turbulant air that allows the full charge to slide on past, like an air lubricant. this keeps the full mixed charge suspended, and not falling/collecting on the surfaces.......ok, i'm not gonna lie.....i'm drunk right now......and, you can milti-quote mopar, for one post, not 6, or whatever, lol